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1
JEE Main 2021 (Online) 31st August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Lithium salts are hydrated.

Reason (R) : Lithium has higher polarising power than other alkali metal group members.

In the light of the above statements, choose the most appropriate answer from the options given below :
A
Both (A) and (R) are correct but (R) is not the correct explanation of (A)
B
(A) is correct but (R) is not correct.
C
(A) is not correct but (R) is correct.
D
Both (A) and (R) are correct and (R) is the correct explanation of (A)
2
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
The major component/ingredient of Portland Cement is :
A
tricalcium aluminate
B
tricalcium silicate
C
dicalcium aluminate
D
dicalcium silicate
3
JEE Main 2021 (Online) 27th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
The number of water molecules in gypsum, dead burnt plaster and plaster of Paris, respectively are :
A
2, 0 and 1
B
0.5, 0 and 2
C
5, 0 and 0.5
D
2, 0 and 0.5
4
JEE Main 2021 (Online) 26th August Morning Shift
MCQ (Single Correct Answer)
+4
-1
What are the products formed in sequence when excess of CO2 is passed in slaked lime?
A
Ca(HCO3)2, CaCO3
B
CaCO3, Ca(HCO3)2
C
CaO, Ca(HCO3)2
D
CaO, CaCO3
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